KABUL — Afghanistan marks 10 years since the start of the US-led war against the Taliban Friday amid heightened security and questions over what the next decade will hold.

Security is being stepped up in the capital Kabul after a string of major attacks including the assassination of peace envoy Burhanuddin Rabbani, which has thrown government strategy for talking peace with the Taliban into turmoil.

On the frontlines, it is likely to be business as usual for the 140,000 international troops in Afghanistan, of whom 100,000 are from the United States, as they continue the fight against a brutal, Taliban-led insurgency.

For many Afghans, the anniversary will be a time for reflection on what the war has meant for their country and how the withdrawal of all foreign combat troops by the end of 2014 will affect them in future.